WO2017000603A1 - Organosilicone composition, reflective coating, preparation method therefor and photovoltaic module comprising same - Google Patents

Abstract

Disclosed are an organosilicone composition, reflective coating, preparation method therefor and photovoltaic module comprising same. The organosilicon composition comprises basic polymerizable component, catalyst, crosslinking agent and reflective particles, wherein, the basic polymerizable component, catalyst and crosslinking agent are not mixed simultaneously before use. The basic polymerizable component comprises: 100 parts by weight of polymethylsiloxane having at least two Si-Vi bonds per molecule, 5-15 parts by weight of hydrogenated epoxy resin or aliphatic epoxy resin modified hydroxyl-terminated poly(methyl vinyl siloxane), 10-20 parts by weight of siloxane resin having at least two Si-Vi bonds. The crosslinking agent is polyorganosiloxane having at least two Si-H bonds.

Description

Silicone composition, reflective coating, preparation method thereof and photovoltaic module including same

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 20151037331, filed on Jun. 30, 2015, the entire content of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of photovoltaic cells, and in particular to a silicone composition, a reflective coating, and a method of making the same, and a photovoltaic module including the reflective coating.

Background technique

A photovoltaic cell module (a solar cell module) is a product that directly converts solar light into electric energy through a P-N junction by utilizing the photovoltaic effect of a semiconductor such as silicon. In the photovoltaic cell assembly, when the back plate is a transparent material, a reflective coating is usually used on the back plate, and the light transmitted from the front surface to the back plate is reflected back to the battery sheet to improve the utilization of sunlight, thereby improving the overall assembly. Performance to ensure safe and stable operation of photovoltaic power generation systems.

At present, the reflective coating in the photovoltaic cell assembly is usually formed by hand-coating a one-component condensed silica gel on a backing plate and formed by moisture curing. The one-component condensed silica gel does not need to be heated during the application process, and can be cured at room temperature under the action of moisture, and the process is relatively simple. However, due to the limitations of the properties of the one-component condensed silica gel, the application also has the following problems: 1 deep curing is slow, and curing 5 mm also requires more than 24 hours; 2 the glue is in the form of a paste, the viscosity is large, and the thickness is difficult to control accurately when used; When the position of the coating is irregular, the construction is difficult, the consistency is poor, and the efficiency is low; 3 small molecules are released during curing, such as small molecules remaining in the coating will affect the coating performance;

In order to improve the above problems, researchers have also tried to select a faster two-component silica gel. However, the two-component silica gel is often inferior to the one-component condensed silica gel, which is likely to cause a reflective coating. The delamination is not conducive to production applications.

Summary of the invention

An object of the present disclosure is to provide a silicone composition, a reflective coating, a method of preparing the same, and a photovoltaic module including the same, to improve the curing time while shortening the curing time of the reflective coating prepared from the silicone composition Adhesion of the coating.

In order to achieve the above object, in a first aspect of the present disclosure, a silicone composition is provided, the silicone composition The base polymerization component, the catalyst, the crosslinking agent and the reflective particles are included, wherein the base polymerization component, the catalyst and the crosslinking agent are not mixed before use, and the base polymerization component comprises: 100 parts by weight of at least two per molecule Si-Vi bonded polymethylsiloxane, 5-15 parts by weight of hydrogenated epoxy resin or cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, 10-20 parts by weight A silicone resin containing at least two Si-Vi bonds, the crosslinking agent being a polyorganosiloxane containing at least two Si-H bonds.

In a second aspect of the present disclosure, there is provided a reflective coating formed by mixing a silicone composition as described above and curing.

In a third aspect of the present disclosure, there is provided a method of preparing the above reflective coating, the method comprising the steps of: partially polymerizing a component, partially reflecting particles, optionally mechanics under a first agitation condition The functional filler and the catalyst are mixed to obtain the mixed component A; under the second stirring condition, the remaining basic polymerization component, the remaining reflective particles, the optional mechanical functional filler, the crosslinking agent, the optional inhibitor, The selected tackifier is mixed to obtain a mixed component B; the mixed component A and the mixed component B are stirred and mixed to obtain a preparation having a viscosity of 6000-10000 CP; the preparation is covered on the substrate, Curing is carried out under curing conditions to form the reflective coating, the base polymerization component comprising: 100 parts by weight of polymethylsiloxane containing at least two Si-Vi bonds per molecule, 5-15 parts by weight Hydrogenated epoxy resin or cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, 10-20 parts by weight of a silicone resin containing at least two Si-Vi bonds, said crosslinking The agent is a polyorganic organic containing at least two Si-H bonds Oxide.

The above technical solution is a silicone composition, a reflective coating and a preparation method thereof, by using a liquid polysiloxane containing at least two Si-Vi bonds per molecule, a hydrogenated epoxy resin or an alicyclic epoxy resin. a terminal hydroxyl-terminated polymethylvinylsiloxane, and a silicone resin containing at least two Si-Vi bonds as a base polycomponent, and using a polyorganosiloxane containing at least two Si-H bonds The cross-linking agent can obtain a silica gel composition with more moderate bonding strength, thereby improving the adhesion of the reflective coating prepared by the same while shortening the curing time, and at the same time being capable of mixing a higher proportion of the reflective material, A higher reflectivity is obtained, which in turn increases the solar utilization of the photovoltaic module comprising the retroreflective coating prepared therefrom.

Other features and advantages of the present disclosure will be described in detail in the Detailed Description of the Detailed Description.

detailed description

Specific embodiments of the present disclosure are described in detail below. It is to be understood that the specific embodiments described herein are not to be construed

In the present disclosure, the term "Vi" means a vinyl group, "Si-Vi bond" means a bond bond between a silicon atom and a vinyl group, and "Si-H" means a bond bond formed between a silicon atom and a hydrogen atom.

As indicated in the background section, in the process of preparing the reflective coating, there is a problem that the one-component condensed silica gel has high viscosity, slow deep curing, and difficult construction, and the two-component silica gel tends to have low bonding strength and easy delamination. . In order to improve this problem, the inventors of the present disclosure have provided a silicone composition. The silicone composition includes a base polymerization component, a catalyst, a crosslinking agent, and a reflective particle, wherein the base polymerization component, the catalyst, and the crosslinking agent are mixed at different times before use, characterized in that The base polymerization component comprises: 100 parts by weight of polymethylsiloxane containing at least two Si-Vi bonds per molecule, 5-15 parts by weight of hydrogenated epoxy resin or alicyclic epoxy resin modified end Hydroxypolymethylvinylsiloxane, 10-20 parts by weight of a silicone resin containing at least two Si-Vi bonds, the crosslinking agent being a polyorganosiloxane containing at least two Si-H bonds .

The present disclosure relates to the above silicone composition, reflective coating, and method of making the same. By using a liquid polysiloxane containing at least two Si-Vi bonds per molecule, a hydrogenated epoxy resin or an alicyclic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, and containing at least two A Si-Vi bond siloxane resin is used as a base poly component, and a cross-linking agent of a polyorganosiloxane containing at least two Si-H bonds is used to obtain a silica gel composition having a more moderate bond strength, thereby enabling While shortening the curing time, the adhesion of the reflective coating prepared therefrom is improved, and at the same time, it is capable of mixing a higher proportion of the reflective material to obtain a higher light reflectance, thereby improving the reflective coating comprising the same. Solar utilization of photovoltaic modules.

In order to facilitate adjustment of the viscosity of the silica gel formed after the silicone composition is mixed, the reaction speed of the silica gel is increased. In an optional embodiment of the present disclosure, the above silicone composition comprises component A and component B, wherein component A contains at least a portion of a base polymerization component and a catalyst, and component B contains at least a remainder The base polymerization component and the crosslinking agent. By dividing the silicone composition into component A and component B, and then mixing component A and component B to form a silica gel, it is advantageous to adjust the viscosity of the silica gel, thereby making the processed properties of the prepared silica gel so that it can be used. The web printing method is applied to the back sheet.

Optionally, in the above silicone composition, component A comprises: polymethylsiloxane containing at least two Si-Vi bonds per molecule, 45-55 parts by weight; hydrogenated epoxy resin or alicyclic group Epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 2.5-7.5 parts by weight; silicone resin containing at least two Si-Vi bonds, 5-10 parts by weight; catalyst, 0.015-0.075 parts by weight Reflective particles, 1.5-5 parts by weight, component B comprises: polymethylsiloxane containing at least two Si-Vi bonds per molecule, 45-55 parts by weight; hydrogenated epoxy resin or cycloaliphatic epoxy Resin-modified hydroxyl-terminated polymethylvinylsiloxane, 2.5-7.5 parts by weight; silicone resin containing at least two Si-Vi bonds, 5-10 parts by weight; containing at least two Si-H bonds Polyorganosiloxane crosslinker, 0.75-10 parts by weight; reflective granules, 1.5-5 parts by weight.

In the above silicone composition of the present disclosure, there is no particular requirement for the raw materials used, as long as the desired Si-Vi bond is contained in the polymethylsiloxane and the siloxane resin, the cross-linking polyorganosiloxane The alkane crosslinker contains the desired Si-H bond, The hydroxylated polymethylvinylsiloxane containing a hydrogenated epoxy resin or an alicyclic epoxy resin modification can achieve the effects mentioned in the present disclosure. However, in order to further optimize the processing properties and the use properties of the silica gel formed by the mixing of the silicone composition, the raw materials of the above-mentioned silicone composition can be optimally selected, as follows:

Optionally, the polymethylsiloxane containing at least two Si-Vi bonds per molecule used in the above silicone composition has a vinyl content of 0.02-0.8 wt.% and a viscosity of 200-500,000. CP. By controlling the content of vinyl (Vi) in the polymethylsiloxane containing at least two Si-Vi bonds, it is advantageous to control the viscosity of the silicone composition, thereby controlling the workability of the adhesive and the thickness of the coating.

Polymethylsiloxanes containing at least two Si-Vi bonds per molecule that may be used in the present disclosure include, but are not limited to, alpha, omega-divinyl dimethicone and vinyl dimethyl silicon At least one blocked polydimethylmethylvinylsiloxane of the oxy group.

The polymethylsiloxane having at least two Si-Vi bonds per molecule which can be used in the present disclosure may be a commercially available product or may be synthesized according to a conventional synthesis method. Commercially available products that may be used include, but are not limited to, α,ω-divinylpolydimethylsiloxane commercially available from Amba Company (vinyl content of 0.1-0.4 wt.%, viscosity at 25 ° C of 500- 10000CP), vinyl dimethylsiloxy-terminated polydimethylmethylvinylsiloxane (vinyl content of 0.5-2.0wt.%, viscosity at 25 ° C is 200-15000CP); or commercially available from Zhejiang Runhe Company's α,ω-divinylpolydimethylsiloxane (vinyl content is 0.12-0.42wt.%, viscosity at 25°C is 500-10000CP); or commercially available from Olaite Company α, Ω-divinylpolydimethylsiloxane (the content of the vinyl group is 0.15-0.45 wt.%, and the viscosity at 25 ° C is 500-10000 CP).

Optionally, the hydrogenated epoxy resin or the cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane in the above silicone composition is encapsulated by a hydrogenated epoxy resin or an alicyclic epoxy resin and a hydroxyl group. The methylvinylpolysiloxane at the end is a modified product formed by polymerization at a weight ratio of 1:0.5-2.5. Controlling the weight ratio of epoxy resin and hydroxyl terminated methylvinylpolysiloxane in the hydroxyl terminated polymethylvinylsiloxane modified by hydrogenated epoxy resin or cycloaliphatic epoxy resin The proportion of the resin in the entire coating, which in turn helps to improve the adhesion of the coating.

The hydrogenated epoxy resin or the alicyclic epoxy resin-modified terminal hydroxyl polymethylvinylsiloxane which can be used in the present disclosure can be selected from commercially available products or can be synthesized according to a conventional synthesis method. In an optional embodiment of the present disclosure, the method for synthesizing the hydrogenated epoxy resin or the cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane comprises: hydrogenating epoxy resin or alicyclic ring The epoxy resin and the hydroxy-terminated methylvinylpolysiloxane are reacted at 100-150 ° C for 6-12 hours under the catalysis of a catalyst such as triphenylphosphine to obtain a reaction product.

In the synthesis of the above hydrogenated epoxy resin or cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, hydrogenated epoxy resins which may be used include, but are not limited to, hydrogenated bisphenol A type epoxy and/or Or hydrogenated bisphenol F type epoxy. Optionally, The hydrogenated epoxy resin or cycloaliphatic epoxy resin has an epoxy equivalent of from 130 to 250. Controlling the epoxy equivalent within the above range is advantageous in securing the functional group content of the hydrogenated epoxy resin or the alicyclic epoxy resin while ensuring that the product is in a flowing state at normal temperature.

Optionally, the content of vinyl (Vi) in the silicone resin containing at least two Si-Vi bonds in the above silicone composition is 0.5-1.5 wt.%; silicon containing at least two Si-Vi bonds The content of Vi in the oxyalkylene resin is limited to this range to ensure the compatibility of the resin with the silicone oil, and on the other hand, to optimize the strength and toughness of the coating to balance the two. Optionally, the above siloxane resin containing at least two Si-Vi bonds contains one of SiO _4/2 and R ₁ SiO _3/2 , R ₂ SiO _2/2 and R ₃ SiO _1/2 or a plurality of, wherein R ₁ , R ₂ , and R ₃ may be the same or different and are Me(CH ₃ -, methyl) or Vi (vinyl). The siloxane resin containing at least two Si-Vi bonds containing the above structural bond can promote the participation of the silicone resin in the polymerization reaction, thereby achieving the effect of improving the strength of the coating layer.

Silicone resins containing at least two Si-Vi bonds that can be used in the present disclosure include, but are not limited to, MQ silicone, MDQ silicone, MTQ silicone. among them:

The MQ silicone resin includes a monofunctional siloxane chain (M, R ₃ SiO _1/2 , R ₃ is a methyl group or a vinyl group) and a tetrafunctional siloxane chain segment (Q, SiO _4/2 ), for example, M/Q is 0.6-0.9 MQ silicone resin, such as MQ silicone resin (Vinyl content 0.54%, and M/Q=0.6) commercially available from Amba Company model VQM60, and commercially available, for example, from Zibo Chemical Technology Co., Ltd. The MQ silicone resin of XB-82063 (vinyl content is 1-4%, and M/Q = 0.6-0.9).

MDQ silicone resin includes monofunctional siloxane chain segments (M, R ₃ SiO _1/2 , R is methyl or vinyl), difunctional siloxane chain segments (D, R ₂ SiO _2/2 , R is methyl or Vinyl) and tetrafunctional silicone chain segments (Q, SiO _4/2 ).

MTQ silicone resin includes monofunctional siloxane chain segments (M, R ₃ SiO _1/2 , R is methyl or vinyl), trifunctional siloxane chain segments (T, R ₁ SiO _3/2 , R is methyl or Vinyl) and tetrafunctional silicone chain segments (Q, SiO _4/2 ).

Optionally, the cross-linking agent of the polyorganosiloxane containing at least two Si-H bonds in the above silicone composition has a hydrogen content of 0.1 to 1 wt.%. In the present disclosure, by controlling the amount of hydrogen contained in the crosslinking agent, it is advantageous to control the mechanical properties of the rubber layer and the reaction speed of the rubber layer.

Polyorganosiloxanes containing at least two Si-H bonds that may be used in the present disclosure include, but are not limited to, trimethylsiloxane terminated dimethylmethylhydrogenpolysiloxane and Si-H dimethyl At least one of the blocked dimethylmethylhydrogenpolysiloxanes.

Alternatively, the catalyst selected in the above silicone composition may be selected according to the reaction rule, and may include, but is not limited to, a compound of a transition metal such as nickel, palladium, rhodium, iridium or platinum. Alternatively, the above catalyst is a platinum catalyst, and the use of a platinum catalyst facilitates obtaining a suitable curing speed. For example, the platinum catalyst is a platinum-vinylsiloxane complex, and wherein the platinum content is 500-5000 ppm; by using a platinum-vinylsiloxane complex, and controlling the platinum content The amount is good for controlling the curing speed of the adhesive layer.

Alternatively, reflective particles that can be used in the above silicone compositions include, but are not limited to, reflective glass microbeads. Among them, reflective glass microspheres having a particle diameter of 0.5 to 3 μm can be selected. The use of reflective glass beads with a particle size of 0.5-3 μm is advantageous for making the reflective glass beads more uniform, better reflecting the light, improving the light reflectivity, and further improving the solar energy utilization rate.

In the above silicone composition, an inhibitor may also be included in order to adjust the service life of the prepared coating. In an optional embodiment of the present disclosure, the above silicone composition further comprises 0.002-0.005 parts by weight based on 100 parts by weight of the polymethylsiloxane containing at least two Si-Vi bonds per molecule. Inhibitor; Optionally, when the silicone composition comprises component A and component B, the inhibitor is mixed in component B.

Inhibitors which may be used in the present disclosure include, but are not limited to, 2-methyl-3-butyn-2-ol, 2-phenyl-3-butyn-2-ol, 3,5-dimethyl-1 -hexyn-3-ol, 1-hexyn-1-cyclohexanol, 3-ethyl-3-butene-1-yne, 1,3-divinyltetramethyldisiloxane, 1, 3,5,7-tetravinyltetramethylcyclotetrasiloxane, 1,3-divinyltetramethyldisiloxane, methyltris(3-methyl-1-butyne-3-oxo One or more of silane, tetramethylethylenediamine, benzotriazole, triphenylphosphine, and maleic acid derivatives. For example, an acetylenic inhibitor is used.

In the above silicone composition, a tackifier may be further included in order to secure the adhesion of the silica gel after aging. In an optional embodiment of the present disclosure, the above silicone composition further comprises 0.05-0.3 parts by weight based on 100 parts by weight of the polymethylsiloxane containing at least two Si-Vi bonds per molecule. a tackifier; optionally, when the silicone composition comprises component A and component B, the tackifier is mixed in component B; in the present disclosure, the tackifier is combined with the crosslinking agent Mixing in component B facilitates avoiding pre-reaction of the tackifier with the feedstock in component A.

Optionally, the tackifier is selected from the group consisting of vinyl triethoxysilane, acryl propyl trimethoxy silane, alkyl acryl propyl trimethoxy silane, allyl triethoxy silane, epoxy An addition reaction of propoxypropyltrimethoxysilane, allyl glycidyl ether, a Si-H containing siloxane with allyl glycidyl ether or methacryloxypropyltrimethoxysilane, One or more of a cohydrolyzed polycondensate of trimethoxysilane and allyltrimethoxysilane.

In the above silicone composition, in order to further improve the mechanical properties and adhesive properties of the adhesive layer, a mechanically functional filler may also be included. In an optional embodiment of the present disclosure, the above silicone composition further comprises 5-20 parts by weight based on 100 parts by weight of the polymethylsiloxane containing at least two Si-Vi bonds per molecule. Mechanically functional filler; optionally, when the silicone composition comprises component A and component B, component A contains 6-10 parts by weight of mechanically functional filler, and component B contains 6-10 parts by weight of mechanics The functional filler; mixing the mechanical functional fillers in the component A and the component B respectively, is beneficial to make the mechanical functional filler and the other raw materials are more uniformly mixed, thereby improving the uniformity of the mechanical properties and the bonding properties of the rubber layer.

Optionally, the mechanical functional filler is a hydrophobically treated filler particle; optionally, the filler particle is white carbon black (vapor white carbon black), activated calcium carbonate, silicon micropowder, diatomaceous earth and titanium dioxide (titanium dioxide) One or more of the gas phase titanium dioxide. The addition of the above filler in the present disclosure is advantageous for improving the mechanical properties and the bonding property of the adhesive layer, and optionally the particle diameter of the filler particles is from 0.5 to 3 μm.

Also provided in the present disclosure is a reflective coating formed by mixing a silicone composition as described above and then curing. The reflective coating provided by the present disclosure is prepared by using the above-mentioned silicone composition, so that it has superior adhesion performance and superior reflectance, and is advantageous for improving the utilization rate of solar energy.

Also provided in the present disclosure is a method of preparing the above reflective coating, the preparation method comprising the steps of: partially polymerizing components, partially reflective particles, optional mechanically functional fillers and catalysts under first agitation conditions Mixing to obtain a mixed component A; under the second stirring condition, the remaining base polymerization component, the remaining reflective particles, the optional mechanical functional filler, the crosslinking agent, the optional inhibitor, and the optional thickening The mixture is mixed to obtain a mixed component B; the mixed component A and the mixed component B are stirred and mixed to obtain a preparation having a viscosity of 6000-10000CP; the preparation is coated on a substrate and cured under curing conditions. Forming a reflective coating, the base polymerization component comprising: 100 parts by weight of polymethylsiloxane containing at least two Si-Vi bonds per molecule, 5-15 parts by weight of hydrogenated epoxy resin or alicyclic ring Oxygen resin modified hydroxyl-terminated polymethylvinylsiloxane, 10-20 parts by weight of a silicone resin containing at least two Si-Vi bonds, the crosslinking agent containing at least two Si-H bonds Polyorganosiloxane.

In order to save energy, in an alternative embodiment, the step of preparing the mixed component A and the mixed component B in the method for preparing the reflective coating comprises: stirring under high temperature (2000-7000 rpm for 20-40 min) , the base polymerization component, the reflective particles and the optional mechanical functional filler are mixed in contact with each other to obtain a mixture, and the mixture is separated into a mixture A and a mixture B; the mixture A and the catalyst are mixed to obtain a mixed component A; B is mixed with a crosslinking agent, an optional inhibitor, and an optional tackifier to obtain a mixed component B;

Optionally, in the above preparation method, the first stirring condition and the second stirring condition are respectively high-speed stirring of 2000-7000 rpm for 20-40 min; and the curing condition is baking for 5-15 min under the condition of 120-150 ° C.

Optionally, in the above preparation method, before the step of stirring and mixing the mixed component A and the mixed component B, the step of grinding the mixture is further included; optionally, the grinding condition is: in the roller The 2-3 passes were carried out in a three-roll mill with a gap of 20-35 μm to obtain a mixed component having a fineness of 20-35 μm.

Also provided in the present disclosure is a photovoltaic module comprising a backing sheet and a reflective coating overlying the backing sheet, the reflective coating being the reflective coating described above. By adopting the above-mentioned reflective coating with good adhesion and light reflectivity, it is advantageous to prolong the service life of the photovoltaic module and improve the utilization of sunlight.

The beneficial effects of the present disclosure will be further explained below in conjunction with specific examples and comparative examples (in the following examples each of the original The materials are all added in parts by weight.

Example 1

(1) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane

100 parts of hydrogenated bisphenol A epoxy resin (commercially available from CVC company model EPALLOY 5000, epoxy equivalent of 230), and 70 parts of hydroxyl terminated methyl vinyl polysiloxane (commercially available from Ampere) The product of the company model DA30, in which the vinyl content is 0.6%), is reacted at 120 ° C for 9 hours under the catalytic action of triphenylphosphine to obtain a reaction product.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 100 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 10 parts of the aforementioned hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content of 0.5%, and M/Q = 0.65), 10 parts of titanium dioxide (particle size of 1 μm), 2 parts of fumed silica (particle size of 0.5 μm), 10 parts of reflective glass beads (particle size of 2 μm), 0.04 parts of Karst Platinum catalyst (commercially available from Dow Corning Corporation model SYC-off 4000 catalyst, platinum mass fraction 0.5%), stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters for the inter-roll gap) 30 microns) two times, to obtain a component A with a fineness of 22 μm;

Mixing of component B: 97.09 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 10 parts of the above hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MDQ type silicone resin (vinyl content is 0.5%, and M/D/Q=3/3/4 ), 10 parts of titanium dioxide (particle size 1 μm), 2 parts of fumed silica (particle size 0.5 μm), 10 parts of reflective glass beads (particle size 2 μm), 2.8 parts of hydrosilyl terminated Dimethylmethylhydrogenpolysiloxane (commercially available from Amba Company, model XL10, with a hydrogen content of 0.75 wt.%), 0.005 parts of 1-hexyne-1-cyclohexanol, 0.15 parts of epoxy Propoxypropyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters of 30 μm between the rolls) to obtain a component B having a fineness of 25 μm;

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 7800CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The parts were then baked at 150 ° C for 10 min to form a reflective coating.

Example 2

(1) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane:

100 parts of hydrogenated bisphenol A epoxy resin (commercially available from CVC company model EPALLOY 5000, epoxy equivalent of 230), and 200 parts of hydroxyl terminated methyl vinyl polysiloxane (commercially available from Ambia) The product of the company model DA30, wherein the vinyl content is 0.6%), was reacted at 120 ° C for 9 hours under the catalytic action of triphenylphosphine to obtain a reaction product.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 81 parts of vinyl dimethylsiloxy-terminated polydimethylsiloxane (commercially available from Runhe Company model RH301, vinyl content of 0.04%, viscosity (25 °C) is 100000CP) and 19 parts of vinyl dimethylsiloxy-terminated polydimethylsiloxane (commercially available from Amba Company model VS200, vinyl content of 0.675%, viscosity (25 ° C ) is 200CP), 10 parts of the above hydrogenated epoxy resin modified hydroxyl terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Zibo Chemical Technology Co., Ltd. model XB-82062, ethylene Base content is 4%, and M/Q = 0.6), 10 parts of titanium dioxide (particle size is 1 μm), 2 parts of fumed silica (particle size of 0.5 μm), and 10 parts of reflective glass beads (particle size of 2 μm) ), 0.04 parts of Karlstr. Platinum catalyst (commercially available from Dow Corning, model SYC-off 4000, platinum with a mass fraction of 0.5%), stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding) The parameter is 30 micrometers between the rolls, twice, to obtain the component A with a fineness of 25 microns;

Mixing of component B: 75 parts of vinyl dimethylsiloxy-terminated polydimethylsiloxane (commercially available from Runhe Company model RH301, vinyl content of 0.04%, viscosity (25 °C) is 100000CP) and 17.62 parts of vinyl dimethylsiloxy-terminated polydimethylsiloxane (commercially available from Amba Company model VS200, vinyl content of 0.675%, viscosity (25 ° C ) is 200CP), 10 parts of the above hydrogenated epoxy resin modified hydroxyl terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Zibo Chemical Technology Co., Ltd. model XB-82062, ethylene Base content is 4%, and M/Q = 0.6), 10 parts of titanium dioxide (particle size is 1 μm), 2 parts of fumed silica (particle size of 0.5 μm), and 10 parts of reflective glass beads (particle size of 2 μm) ), 7.16 parts of dimethyl-terminated dimethylmethylhydrogenpolysiloxane (commercially available from Amba Company model XL10, hydrogen content 0.75 wt.%), 0.005 parts 1- Hexyne-1-cyclohexanol, 0.15 parts of glycidoxypropyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameter is 30 micron between rolls) ) Twice to give a fineness of 24 microns component B;

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 9600CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The parts were then baked at 150 ° C for 10 min to form a reflective coating.

Example 3

(I) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane: The preparation method of the epoxy modified terminal hydroxyl polymethylvinylsiloxane in the same manner as in Example 2.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 100 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 10 parts of the aforementioned hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content of 0.5%, and M/Q = 0.65), 10 parts of titanium dioxide (particle size: 0.2 μm), 2 parts of fumed silica (particle size of 0.3 μm), 10 parts of reflective glass beads (particle size of 1.5 μm), and 10 parts of reflective Glass beads (particle size 1.5 μm), 0.04 parts of Karlsplatin catalyst (commercially available from Dow Corning, model SYC-off 4000, platinum with a mass fraction of 0.5%), stirred at 500 rpm for 30 min, After grinding through a three-roll mill (grinding parameters are 30 micron gap between the rolls) two times, to obtain a component A with a fineness of 25 microns;

Mixing of component B: 94.4 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 10 parts of the aforementioned hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content of 0.5%, and M/Q = 0.65), 10 parts of titanium dioxide (particle size: 0.2 μm), 2 parts of fumed silica (particle size: 0.3 μm), 10 parts of reflective glass beads (particle size: 1.5 μm), 4.6 parts Hydrogen dimethyl terminated dimethyl methyl hydrogen polysiloxane (commercially available from Zibo Chemical Technology Co., Ltd. model XB-711, hydrogen content is 0.45 wt.%), 0.005 parts 1-hex Alkyn-1-cyclohexanol, 0.15 parts of glycidoxypropyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters: 30 μm between rolls) Component B having a fineness of 25 microns;

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 7800CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The parts were then baked at 150 ° C for 10 min to form a reflective coating.

Example 4

(1) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane

100 parts of hydrogenated bisphenol A epoxy resin (commercially available from Shanghai Zhongshi Company model YL6753, epoxy equivalent 180), with 255 parts of hydroxy-terminated methylvinylpolysiloxane (commercially available from Amba, model DA30, with a vinyl content of 0.6%) under the catalysis of triphenylphosphine The reaction was carried out at 120 ° C for 9 hours to obtain a reaction product.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 80 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS2000, vinyl content of 0.2%, viscosity (25 ° C)) 2000CP), 20 parts of vinyl dimethylsiloxy-terminated polydimethylmethylvinylsiloxane (commercially available from Amba Company model VDM65000, vinyl content of 3.5%), 10 parts of the foregoing Hydrogenated epoxy resin modified hydroxyl terminated polymethylvinylsiloxane, 10 parts MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content 0.5%, and M/Q = 0.65) 10 parts of titanium dioxide (particle size 0.5 μm), 2 parts of fumed silica (particle size 0.2 μm), 10 parts of reflective glass beads (particle size 1.5 μm), 0.04 parts of Karlsplatin catalyst The product purchased from Dow Corning's model number is SYC-off 4000, the mass fraction of platinum is 0.5%), stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters are 30 μm between rolls). Obtaining component A having a fineness of 24 μm;

Mixing of component B: 77.6 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS2000, vinyl content of 0.2%, viscosity (25 ° C) 2000CP), 22.4 parts of vinyl dimethylsiloxy-terminated polydimethylmethylvinylsiloxane (commercially available from Amba Company model VDM65000, vinyl content of 3.5%), 10 parts of the foregoing Hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content 0.5%, and M/Q = 0.65), 10 parts of titanium dioxide (particle size 0.5 μm), 2 parts of fumed silica (particle size 0.2 μm), 10 parts of reflective glass beads (particle size 1.5 μm), 22.3 parts of dimethylhydrogen terminated Dimethylmethylhydrogenpolysiloxane (commercially available from Amba Company model XL13, hydrogen content 0.38 wt.%), 0.005 parts 1-hexyne-1-cyclohexanol, 0.15 part epoxy Propoxypropyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameter is 30 μm between rolls) to obtain component B with a fineness of 25 μm.

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 8100CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The parts were then baked at 150 ° C for 10 min to form a reflective coating.

Example 5

(1) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane: hydrogenated epoxy in the same manner as in Example 1. A method for preparing a resin-modified terminal hydroxyl polymethylvinylsiloxane.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 100 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 15 parts of the aforementioned hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Amba Company model VQM60, vinyl content of 0.5%, and M/Q = 0.65), 15 parts of titanium dioxide (particle size of 1 μm), 3 parts of fumed silica (particle size of 0.5 μm), 3 parts of reflective glass beads (particle size of 2 μm), 0.12 parts of Karst Platinum catalyst (commercially available from Dow Corning Corporation model SYC-off 4000 catalyst, platinum mass fraction 0.5%), stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters for the inter-roll gap) 30 microns) two times, to obtain a component A with a fineness of 22 microns;

Mixing of component B: 97.07 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 15 parts of the above hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 10 parts of MQ silicone resin (commercially available from Ambiente model VQM60, vinyl content of 0.5%, And M/Q = 0.65), 15 parts of titanium dioxide, 3 parts of fumed silica, 3 parts of reflective glass beads, 5.66 parts of hydrogen terminated polydimethylmethylhydrogensiloxane (commercially available from Ambia) The company's model is XL10, with a hydrogen content of 0.75wt.%), 0.005 parts of ethynylcyclohexanol, 0.15 parts of glycidoxypropyltrimethoxysilane, stirred at 500rpm for 30min, and then passed through three rolls. Grinding machine grinding (grinding parameter is 30μm between the rolls) two times, to obtain a component B with a fineness of 22 microns;

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 8500CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The portion was then baked at 120 ° C for 15 min to form a reflective coating.

Example 6

(I) Preparation of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane: A method for preparing a hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane as in Example 1.

(2) Mixing of component A and component B in the silicone composition

Mixing of component A: 103 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 5 parts of the above hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 20 parts of MQ silicone resin (commercially available from Ambia company model VQM60 The product has a vinyl content of 0.5% and M/Q = 0.65), 8 parts of titanium dioxide (particle size 1 μm), 2 parts of fumed silica (particle size of 0.5 μm), and 10 parts of reflective glass beads ( Particle size 2μm), 0.16 parts of Karlsplatin catalyst (commercially available from Dow Corning Corporation model SYC-off 4000 catalyst, platinum mass fraction 0.5%), stirred at 500rpm for 30min, then three rolls Grinding machine grinding (grinding parameter is 40μm between the rolls) two times, to obtain a component A with a fineness of 25 microns;

Mixing of component B: 97.07 parts of α,ω-divinylpolydimethylsiloxane (commercially available from Amba Company model VS5000, vinyl content of 0.16%, viscosity (25 ° C) 5000CP), 5 parts of the aforementioned hydrogenated epoxy resin modified hydroxyl-terminated polymethylvinylsiloxane, 20 parts of MQ silicone resin (commercially available from Ambiente model VQM60, vinyl content of 0.5%, And M/Q = 0.65), 8 parts of titanium dioxide (particle size of 1 μm), 2 parts of fumed silica (particle size of 0.5 μm), 6 parts of reflective glass beads (particle size of 2 μm), 5.66 parts of silicon Hydrogen-terminated polydimethylmethylhydrogensiloxane (commercially available from Amba Company model XL10, hydrogen content 0.75 wt.%), 0.007 part ethynylcyclohexanol, 0.4 part epoxy propylene oxide Propyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters of the inter-roll gap of 40 μm) two times to obtain a component B with a fineness of 25 microns;

(3) Preparation of reflective coating

Mixing component A and component B in a weight ratio of 1:1 to obtain a mixture having a viscosity of 6500CP; printing a uniformly mixed silicone composition on a back sheet using a 100 mesh screen printing machine to be reflective The portion was then baked at 150 ° C for 8 min to form a reflective coating.

Example 7

(I) Preparation of alicyclic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane: preparation method of hydrogenated epoxy resin modified terminal hydroxyl polymethylvinylsiloxane according to Example 1 The difference is that an alicyclic epoxy (commercially available from JADADA, JE-8421 model, epoxy equivalent of 135) is used instead of hydrogenated bisphenol A epoxy resin.

(2) a mixture of component A and component B in the silicone composition: a method of mixing component A and component B in the silicone composition of Example 1,

(III) Preparation of reflective coating: The preparation method of the reflective coating in the same manner as in Example 1.

Comparative example 1

The method employed was as described in the method of Example 1, except that no epoxy-modified terminal hydroxypolymethylvinylsiloxane was added to both components A and B.

Comparative example 2

The method employed was as described in the method of Example 1, except that no reflective glass microspheres were present in both components A and B.

Comparative Example 3 (reflective coating prepared by one-component condensed silica gel)

(1) A mixture of silicone compositions, 200 parts by weight of one-component condensed white silica gel (commercially available from Tianshan Company, 1527W type one-component condensed silica gel) and 20 parts of reflective glass beads (having a particle size of 2 μm) , stirring at a speed of 500 rpm for 30 min under vacuum

(2) Preparation of reflective coating

The above-mentioned organosilica composition was applied by extrusion and knife coating to the portion of the back sheet where reflection was required, and left at room temperature for 48 hours to form a reflective coating.

Comparative Example 4 (reflective coating prepared by existing two-component addition molding silica gel)

(1) Mixing of silicone composition, 200 parts by weight of two-component addition molding silica gel (commercially available from Rainbow Glue Company TB0330 two-component addition molding silica gel) and 20 parts of reflective glass microbeads (particle size of 2 μm) 0.15 parts of glycidoxypropyltrimethoxysilane, stirred at 500 rpm for 30 min, and then ground by a three-roll mill (grinding parameters of 30 μm between rolls) to obtain a fineness of 25 μm. Silicone composition;

(2) Preparation of reflective coating

The above-mentioned organic silica gel composition was printed on a 100-mesh screen printing machine with a uniformly-mixed silicone composition on a portion of the back sheet where reflection was required, and baked at 150 ° C for 30 minutes to form a reflective coating.

The reflective coatings prepared in Examples 1 to 7 and Comparative Examples 1 to 4 were tested as follows.

(1) Test items and test methods

(1) Adhesion: According to the silicone compositions of Examples 1 to 7 and Comparative Examples 1 to 4 and the method of forming the reflective coating, a corresponding reflective coating was formed on the surface of the glass (area 50 mm * 50 mm), and then in accordance with GB. /T 9286-1998 for testing;

(2) Double 85 (in an environment of a temperature of 85 ° C and a humidity of 85%) 1000 hours of adhesion: The silicone composition according to Examples 1 to 7 and Comparative Examples 1 to 4 and a method of forming a reflective coating are After forming a corresponding reflective coating on the glass surface (area 50mm*50mm), it is placed in an environment of temperature 85 ° C and humidity 85% for 1000 hours, and taken out according to GB/T 9286-1998:

(3) Yellowing index

Testing equipment: yellowing instrument;

Test samples (at least three groups) were produced: according to the silicone compositions and the methods for forming the reflective coatings of Examples 1 to 7 and Comparative Examples 1 to 4, the glass surface was uniformly coated with a reflective coating of 0.15 ± 0.05 mm thickness. Floor;

Test requirements: test the Δb value of the coating (ie, the yellow index value), and compare the difference of b values before and after 1000 hours of aging with double 85 (temperature 85 ° C, humidity 85% environment), that is, Δb after double 85 1000 hours ;

(4) Reflectivity

Testing equipment: light transmittance / reflectivity tester;

Test samples (at least three groups) were produced: according to the silicone compositions and the methods for forming the reflective coatings of Examples 1 to 7 and Comparative Examples 1 to 4, the glass surface was uniformly coated with a reflective coating of 0.15 ± 0.05 mm thickness. Floor;

Test requirements: The coating has a uniform reflectance and the ratio of the reflected light intensity of the test coating to the intensity of the incident light.

(2) Test results, as shown in Table 1.

Table 1.

As can be seen from the data in Table 2, by using a liquid polysiloxane containing at least two Si-Vi bonds per molecule, the epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, and containing at least two A Si-Vi bond silicone resin is used as a base poly component, and a cross-linking agent of a polyorganosiloxane containing at least two Si-H bonds is used to obtain a more suitable bond strength. The silica gel composition, in turn, can improve the adhesion of the retroreflective coating prepared therefrom while shortening the curing time. At the same time, it is capable of mixing a higher proportion of light-reflecting substances to obtain a higher light-reflecting rate, thereby improving the solar utilization efficiency of the photovoltaic module including the reflective coating prepared therefrom.

The preferred embodiments of the present disclosure have been described in detail above, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical idea of the present disclosure. All fall within the scope of protection of the present disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not be further described in various possible combinations.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims (27)

1. A silicone composition comprising a base polymerization component, a catalyst, a crosslinking agent, and a reflective particle, wherein the base polymerization component, the catalyst, and the crosslinking agent are mixed at different times before use, the basis The polymerization component comprises: 100 parts by weight of polymethylsiloxane containing at least two Si-Vi bonds per molecule, 5-15 parts by weight of hydrogenated epoxy resin or alicyclic epoxy resin modified terminal hydroxyl group Polymethylvinylsiloxane, 10-20 parts by weight of a silicone resin containing at least two Si-Vi bonds, which are polyorganosiloxanes containing at least two Si-H bonds.
2. The silicone composition according to claim 1, comprising: component A and component B, wherein

   The component A contains at least a part of the base polymerization component and the catalyst,

   The component B contains at least the remainder of the base polymerization component and the crosslinking agent.
3. The silicone composition according to claim 1 or 2, wherein

   The component A comprises:

   The polymethylsiloxane containing at least two Si-Vi bonds per molecule, 45-55 parts by weight;

   The hydrogenated epoxy resin or cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, 2.5-7.5 parts by weight;

   The silicone resin containing at least two Si-Vi bonds, 5-10 parts by weight;

   The catalyst, 0.015-0.075 parts by weight;

   The reflective particles, 1.5-5 parts by weight,

   The component B comprises:

   The polymethylsiloxane containing at least two Si-Vi bonds per molecule, 45-55 parts by weight;

   The hydrogenated epoxy resin or cycloaliphatic epoxy resin modified terminal hydroxyl polymethylvinylsiloxane, 2.5-7.5 parts by weight;

   The silicone resin containing at least two Si-Vi bonds, 5-10 parts by weight;

   a crosslinking agent of the polyorganosiloxane containing at least two Si—H bonds, 0.75-10 parts by weight;

   The reflective particles are 1.5 to 5 parts by weight.
4. The silicone composition according to any one of claims 1 to 3, wherein the content of the vinyl group in the polymethylsiloxane containing at least two Si-Vi bonds per molecule is 0.02-0.8 wt. %, viscosity is 200-50 million CP.
5. The silicone composition according to any one of claims 1 to 4, wherein the hydrogenated epoxy resin or the cycloaliphatic epoxy resin-modified terminal hydroxyl polymethylvinylsiloxane is hydrogenated epoxy A modified product formed by polymerization of a resin or an alicyclic epoxy resin and a hydroxy-terminated methylvinylpolysiloxane in a weight ratio of 1:0.5-2.5.
6. The silicone composition according to any one of claims 1 to 5, wherein the epoxy resin has an epoxy equivalent of from 130 to 250.
7. The silicone composition according to any one of claims 1 to 6, wherein the silicone resin containing at least two Si-Vi bonds has a vinyl group content of from 0.5 to 1.5% by weight.
8. The silicone composition according to claim 7, wherein said siloxane resin containing at least two Si-Vi bonds includes SiO _4/2 and R ₁ SiO _3/2 , R ₂ SiO _2/2 and R ₃ SiO _1/2, one or more, wherein R _1, R _2, R ₃ may be the same or different, is Me or Vi.
9. The silicone composition according to any one of claims 1 to 8, wherein the polyorganosiloxane containing at least two Si-H bonds has a hydrogen content of from 0.1 to 1% by weight.
10. The silicone composition according to any one of claims 1 to 9, wherein the catalyst is a platinum catalyst.
11. The silicone composition according to claim 10, wherein the platinum catalyst is a platinum-vinylsiloxane complex in which the platinum content is from 500 to 5000 ppm.
12. The silicone composition according to any one of claims 1 to 11, wherein the light-reflecting particles are reflective glass microspheres having a particle diameter of 0.5 to 3 μm.
13. The silicone composition according to any one of claims 1 to 12, wherein the silicone composition The present invention further comprises 0.002 to 0.005 parts by weight of an inhibitor based on 100 parts by weight of the polymethylsiloxane having at least two Si-Vi bonds per molecule.
14. The silicone composition according to claim 13, wherein when the silicone composition comprises component A and component B, the inhibitor is mixed in the component B.
15. The silicone composition according to claim 13 or 14, wherein the inhibitor is selected from the group consisting of 2-methyl-3-butyn-2-ol, 2-phenyl-3-butyn-2-ol, 3 , 5-dimethyl-1-hexyn-3-ol, 1-hexyne-1-cyclohexanol, 3-ethyl-3-butene-1-yne, 1,3-divinyltetramethyl Disiloxane, 1,3,5,7-tetravinyltetramethylcyclotetrasiloxane, 1,3-divinyltetramethyldisiloxane, methyltris(3-methyl- One or more of 1-butyn-3-oxy)silane, tetramethylethylenediamine, benzotriazole, triphenylphosphine, and maleic acid derivatives.
16. The silicone composition according to any one of claims 1 to 15, wherein the silicone composition is based on 100 parts by weight of the polymethyl silicon having at least two Si-Vi bonds per molecule. The oxane further comprises 0.05 to 0.3 parts by weight of a tackifier.
17. The silicone composition according to claim 16, wherein when the silicone composition comprises component A and component B, the tackifier is mixed in the component B.
18. The silicone composition according to claim 16 or 17, wherein the tackifier is selected from the group consisting of vinyltriethoxysilane, acryloylpropyltrimethoxysilane, alkylacryloylpropyltrimethoxysilane, Allyl triethoxysilane, glycidoxypropyltrimethoxysilane, allyl glycidyl ether, Si-H containing siloxane with allyl glycidyl ether or methacryloxypropyl One or more of an addition reactant of a trimethoxysilane, a cohydrolyzed polycondensate of a trimethoxysilane and allyltrimethoxysilane.
19. The silicone composition according to any one of claims 1 to 18, wherein the silicone composition is based on 100 parts by weight of a polymethylsiloxane containing at least two Si-Vi bonds per molecule It also includes 5-20 parts by weight of mechanically functional filler.
20. The silicone composition according to claim 19, wherein said silicone composition comprises component A and components In the case of B, the component A contains 6 to 10 parts by weight of the mechanically functional filler, and the component B contains 6 to 10 parts by weight of a mechanically functional filler.
21. The silicone composition according to claim 19 or 20, wherein the mechanically functional filler is a hydrophobically treated filler particle.
22. The silicone composition according to claim 21, wherein the filler particles are one or more of active calcium carbonate, silicon fine powder, diatomaceous earth and titanium dioxide.
23. A reflective coating formed by mixing and curing a silicone composition according to any one of claims 1 to 22.
24. A method of preparing the retroreflective coating of claim 23 comprising the steps of:

    Under a first stirring condition, a part of the base polymerization component, a part of the reflective particles, an optional mechanical functional filler and a catalyst are mixed to obtain a mixed component A;

    Mixing the remaining base polymerization component, the remaining reflective particles, the optional mechanical functional filler, the crosslinking agent, the optional inhibitor, and the optional tackifier under a second agitation condition to obtain a mixed component B ;

    Mixing the mixed component A and the mixed component B to obtain a preparation having a viscosity of 6000-10000CP; covering the preparation on a substrate and curing under curing conditions to form the reflective coating ,

    The base polymerization component comprises: 100 parts by weight of polymethylsiloxane containing at least two Si-Vi bonds per molecule, 5-15 parts by weight of hydrogenated epoxy resin or alicyclic epoxy resin modification Hydroxyl-terminated polymethylvinylsiloxane, 10-20 parts by weight of a silicone resin containing at least two Si-Vi bonds, the cross-linking agent being a polyorganosilicon containing at least two Si-H bonds Oxytomane.
25. The method of claim 24, wherein

    The first stirring condition and the second stirring condition are respectively high speed stirring of 2000-7000 rpm for 20-40 min;

    The curing conditions are baked at 120-150 ° C for 5-15 min.
26. The method according to claim 24 or 25, wherein before the step of stirring and mixing the mixed component A and the mixed component B, the method further comprises separately mixing the component A and the mixing component B a step of grinding;

    The polishing conditions were as follows: grinding was carried out 2-3 times in a three-roll mill having a gap between rolls of 20 to 35 μm to obtain a mixed component having a fineness of 20 to 35 μm.
27. A photovoltaic module comprising a backsheet and a reflective coating overlying the backsheet, wherein the reflective coating is the reflective coating of claim 23.